What is the empirical formula of cupric oxalate, if the compound contains 41.93% Cu, 15.85% C and 42.22% O by mass? (Cu = 63.55, C = 12.0, O = 16.0)

University of Ilorin CHM101 2016 past question

1. CuC₃O₄
2. Cu(C₂O₄)₂
3. CuC₂O₄
4. Cu₂(C₂O₄)₃

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